A vehicle battery pack changing device

Abstract

The application provides a vehicle battery pack replacement device, which comprises a frame, a ground rail, a horizontal driving device, the frame is slidably connected to the ground rail, a lifting rail is arranged on the frame, a lifting seat is slidably connected to the lifting rail, a battery pack taking and placing device is arranged on the lifting seat, the battery pack taking and placing device comprises a rotary driving device arranged on the lifting seat, a rotary seat is arranged on the rotary driving device, a levelness adjusting device is arranged on the rotary seat, a first adjusting seat is arranged on the levelness adjusting device, a first electric telescopic rail is arranged on the first adjusting seat, a second adjusting seat is arranged on the first electric telescopic rail, a second electric telescopic rail is arranged on the second adjusting seat, and a moving seat is arranged on the second electric telescopic rail, and a battery pack pushing and pulling device is further arranged on the moving seat. When the battery pack of the vehicle is replaced, the heavy battery pack can be carried instead of manual operation, and the replaced battery pack can be placed in a battery pack warehouse, so that the replacement efficiency of the battery pack is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle battery replacement technology, and in particular to a vehicle battery pack replacement device. Background Technology

[0002] like Figure 6 As shown, a current type of new energy truck includes a frame 50 and a battery pack 51. The battery pack 51 is mounted on battery mounting brackets on both sides of the frame 50, and the battery mounting brackets are equipped with locking mechanisms for securing the battery pack 51. The structure of the battery pack 51 is as follows: Figure 7 As shown, the battery pack 51 has a rectangular parallelepiped structure. The outer side of the battery pack 51 is made of sheet metal, which provides protection for the battery pack. The battery pack provides energy to the new energy truck. When the battery pack 51 is depleted of power, it needs to be replaced.

[0003] The traditional replacement method is done manually. During replacement, the locking mechanism is first loosened, the operator removes the battery pack from the new energy truck, and then the new battery pack is manually installed onto the battery mounting bracket. Finally, the battery pack is locked in place by the locking mechanism.

[0004] Because the battery pack 51 is large in size and weight, it is difficult to move. Traditional manual replacement methods often require 2 to 3 operators to work together to complete the replacement of the battery pack, which results in high labor costs and low replacement efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art and provide a vehicle battery pack replacement device.

[0006] The objective of this invention is achieved through the following technical solution: a vehicle battery pack replacement device, comprising a frame, a ground rail, and a horizontal drive device, wherein the frame is slidably connected to the ground rail, and the horizontal drive device drives the frame to move axially along the ground rail.

[0007] The frame is equipped with vertically arranged lifting guide rails, and a lifting seat is slidably connected to the lifting guide rails. The frame is equipped with a lifting drive device for driving the lifting seat to rise and fall. The lifting seat is equipped with a battery pack loading and unloading device.

[0008] The battery pack loading and unloading device includes a rotary drive unit mounted on a lifting platform, a rotary seat mounted on the rotary drive unit, a leveling adjustment device mounted on the rotary seat, a first adjusting seat mounted on the leveling adjustment device, a first electric telescopic guide rail mounted on the first adjusting seat, a second adjusting seat mounted on the first electric telescopic guide rail, and a second electric telescopic guide rail mounted on the second adjusting seat. The second electric telescopic guide rail is perpendicular to the first electric telescopic guide rail. A movable seat is mounted on the second electric telescopic guide rail, and a roller frame is mounted on the movable seat. A roller is connected to the roller frame. The movable seat also has a battery pack push-pull device for pulling the battery pack into the movable seat or pushing the battery pack out of the movable seat.

[0009] Preferably, the horizontal drive device includes a rack and a horizontal drive motor mounted on the frame, with the rack parallel to the ground rail; a gear is connected to the horizontal drive motor, and the gear meshes with the rack.

[0010] Preferably, the battery pack push-pull device includes a servo moving device mounted on a movable base, the servo moving device having a moving component, and the servo moving device driving the moving component to move linearly; the moving component is provided with an electromagnetic chuck.

[0011] Preferably, the lifting drive device includes a first rotating shaft, a second rotating shaft, a first chain, a second chain, a lifting drive motor, and a counterweight. The first rotating shaft and the second rotating shaft are rotatably connected to both sides of the upper end of the frame, and the counterweight is located on one side of the frame. The first rotating shaft is provided with a first sprocket and a second sprocket, and the second rotating shaft is provided with a third sprocket. One end of the first chain is connected to one side of the lifting seat, and the other end of the first chain is connected to the counterweight. The first chain is connected to both the first sprocket and the third sprocket.

[0012] One end of the second chain is connected to the other side of the lifting seat, the other end of the second chain is connected to the counterweight, and the second chain is connected to the second sprocket;

[0013] The lifting drive motor is located at the top of the frame and is connected to the first rotating shaft via a belt drive mechanism.

[0014] Preferably, the belt drive mechanism includes a first pulley mounted on a first rotating shaft and a second pulley mounted on a lifting drive motor, with a belt connecting the first pulley and the second pulley.

[0015] Preferably, the frame is provided with a counterweight guide rail, which is arranged vertically, and the counterweight is slidably connected to the counterweight guide rail.

[0016] Preferably, a ceiling track is provided above the frame, which is parallel to the ground track, and the upper end of the frame is slidably connected to the ceiling track.

[0017] Preferably, the movable seat is provided with a buffer limiting mechanism, which includes a buffer cylinder at one end of the movable seat and a limiting cylinder at the other end of the movable seat. The direction of the buffer cylinder is parallel to the direction of movement of the movable seat relative to the rotating seat; the limiting cylinder is perpendicular to the movable seat; and the rotating seat is provided with a baffle corresponding to the buffer cylinder.

[0018] A first piston is provided in the buffer cylinder, forming a first piston chamber between the first piston and one end of the buffer cylinder. A buffer telescopic rod is connected to the first piston and extends from the other end of the buffer cylinder. The buffer telescopic rod faces the baffle. A first spring is provided in the first piston chamber, with its two ends contacting the first piston and the buffer cylinder respectively. A second piston is provided in the limiting cylinder, forming a second piston chamber between the second piston and the lower end of the limiting cylinder. A second spring is provided between the second piston and the upper end of the limiting cylinder. A limiting telescopic rod extends from the upper end of the limiting cylinder. A connecting pipe is provided between the limiting cylinder and the buffer cylinder, connecting the first piston chamber and the second piston chamber. Transmission fluid is provided in both the first and second piston chambers.

[0019] The second electric telescopic guide rail drives the moving seat to move between the extended position and the retracted position. When the second electric telescopic guide rail is in the retracted position, the buffer telescopic rod presses against the baffle and is in the retracted state. At this time, the limit telescopic rod is in the extended state, and the upper end of the limit telescopic rod is higher than the roller and limits the battery pack above the roller.

[0020] The beneficial effects of this invention are: when replacing the battery pack of a vehicle, this invention can replace manual labor in carrying the heavy battery pack and can put the replaced battery pack into the battery pack warehouse, saving time and effort, improving the battery pack replacement efficiency, and reducing the number of operators. The battery pack replacement operation can be easily completed by one operator, reducing labor costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 for Figure 1 Enlarged view of section A.

[0023] Figure 3 This is a schematic diagram of the structure of the battery pack loading and unloading component from one direction.

[0024] Figure 4 This is a schematic diagram of the battery pack loading and unloading component from another direction.

[0025] Figure 5 This is a schematic diagram of the buffer limiting mechanism.

[0026] Figure 6This is a structural diagram of an existing new energy truck.

[0027] Figure 7 This is a schematic diagram of the battery pack structure.

[0028] In the diagram: 1. Frame, 2. Ground rail, 3. Rack, 4. Lifting guide rail, 5. Lifting seat, 6. Rotating seat, 7. Moving seat, 8. Servo moving device, 9. Roller, 10. Horizontal drive motor, 11. Counterweight guide rail, 12. Counterweight, 13. Ceiling rail, 14. Control device, 15. First rotating shaft, 16. Second rotating shaft, 17. Lifting drive motor, 18. First chain, 19. Electromagnetic chuck, 20. Second chain, 21. Second electric telescopic guide rail, 22. Baffle, 24. First sprocket, 25. Second sprocket, 26. First pulley. 27. Second pulley; 28. Belt; 29. ​​Roller frame; 30. Rotary drive device; 31. Buffer cylinder; 32. Limit cylinder; 33. Connecting pipe; 34. Slider; 35. Moving part; 36. First adjusting seat; 37. Leveling adjustment device; 38. Second adjusting seat; 39. First electric telescopic guide rail; 40. Buffer telescopic rod; 41. First piston; 42. First piston chamber; 43. First spring; 44. Limit telescopic rod; 45. Second piston; 46. Second piston chamber; 47. Second spring; 50. Frame; 51. Battery pack. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] like Figures 1-5 As shown, a vehicle battery pack replacement device includes a frame 1, a ground rail 2, a horizontal drive device, and a control device 14. The frame 1 is a cuboid frame structure. The ground rail 2 is laid on the ground, and the frame 1 is located above the ground rail 2. The frame 1 is slidably connected to the ground rail 2. The horizontal drive device drives the frame 1 to move axially along the ground rail 2, thereby realizing the horizontal movement of the frame 1. A top rail 13 is provided above the frame 1, and the top rail 13 is parallel to the ground rail 2. The upper end of the frame 1 is slidably connected to the top rail 13.

[0033] The horizontal drive device includes a rack 3 and a horizontal drive motor 10 mounted on a frame 1. The rack 3 is laid on the ground and parallel to the ground rail 2. The horizontal drive motor 10 is fixedly mounted at the lower end of the frame 1, and a gear is connected to the horizontal drive motor 10, which meshes with the rack 3. The horizontal drive motor 10 drives the gear to rotate, and through the engagement between the gear and the rack 3, the frame 1 moves horizontally. The horizontal drive motor 10 is electrically connected to a control device 14, which controls the operation of the horizontal drive motor 10.

[0034] The frame 1 is provided with vertically arranged lifting guide rails 4, and a lifting seat 5 is slidably connected to the lifting guide rails 4. The frame 1 is provided with a lifting drive device for driving the lifting seat 5 to move up and down along the lifting guide rails 4. The lifting guide rails 4 are located on both sides of the frame 1, and sliders 34 are respectively provided on both sides of the lifting seat 5. The sliders 34 are slidably engaged with the guide rails.

[0035] The lifting drive device includes a first rotating shaft 15, a second rotating shaft 16, a first chain 18, a second chain 20, a lifting drive motor 17, and a counterweight 12. The first rotating shaft 15 and the second rotating shaft 16 are rotatably connected to both sides of the upper end of the frame 1, and the first rotating shaft 15 and the second rotating shaft 16 are parallel to each other. The two ends of the first rotating shaft 15 are connected to the frame 1 via bearings, and the two ends of the second rotating shaft 16 are connected to the frame 1 via bearings. The counterweight 12 is located on one side of the frame 1, and the frame 1 is provided with a counterweight guide rail 11. The counterweight guide rail 11 is arranged vertically, and the counterweight 12 is slidably connected to the counterweight guide rail 11, allowing the counterweight 12 to move up and down along the counterweight guide rail 11. The first rotating shaft 15 is equipped with a first sprocket 24 and a second sprocket 25, and the second rotating shaft 16 is equipped with a third sprocket. One end of the first chain 18 is connected to one side of the lifting seat 5, and the other end of the first chain 18 is connected to the counterweight 12. The first chain 18 connects to both the first sprocket 24 and the third sprocket, and meshes with both sprockets 24 and 25. One end of the second chain 20 is connected to the other side of the lifting seat 5, and the other end of the second chain 20 is connected to the counterweight 12. The second chain 20 connects to the second sprocket 25, and meshes with it. The lifting drive motor 17 is located at the top of the frame 1 and is connected to the first rotating shaft 15 via a belt drive mechanism.

[0036] The belt drive mechanism includes a first pulley 26 mounted on a first rotating shaft 15 and a second pulley 27 mounted on a lifting drive motor 17, with a belt 28 connecting the first pulley 26 and the second pulley 27. The lifting drive motor 17 is electrically connected to a control device 14, which controls the operation of the lifting drive motor 17. The lifting drive motor 17 drives the first rotating shaft 15 to rotate, which in turn drives the first sprocket 24 and the second sprocket 25 on it to rotate synchronously. When the first sprocket 24 and the second sprocket 25 rotate, they respectively drive one end of the first chain 18 and the second chain 20 to move up and down simultaneously, thereby driving the lifting seat 5 to move up and down along the lifting guide rail 4.

[0037] The lifting platform 5 is equipped with a battery pack loading and unloading device. In this invention, the lifting platform has two battery pack loading and unloading devices, allowing simultaneous loading and unloading of two battery packs. Each battery pack loading and unloading device includes a rotary drive 30 mounted on the lifting platform. The rotary drive 30 is electrically connected to and controlled by the control device 14. The rotary drive 30 has a rotating base 6, and the rotating base 6 has a leveling adjustment device 37, which is existing technology. The leveling adjustment device 37 has a first adjusting base 36, a first electric telescopic guide rail 39, a second adjusting base 38, and a second electric telescopic guide rail 21. The second electric telescopic guide rail 21 is perpendicular to the first electric telescopic guide rail 39. The second electric telescopic guide rail 21 has a movable base 7, and the movable base 7 has a roller frame 29. A roller 9 is connected to the roller frame 29. The roller 9 is rotatable. The arrangement direction of the rollers 9 on the roller 9 frame is consistent with the setting direction of the second electric telescopic guide rail 21. Both the first and second electric telescopic guide rails are electrically connected by a control device.

[0038] The movable base 7 is also equipped with a battery pack push-pull device for pulling the battery pack 51 into or pushing the battery pack 51 out of the movable base 7. The battery pack push-pull device includes a servo moving device 8 mounted on the movable base 7, and a moving component 35 mounted on the servo moving device 8. The servo moving device 8 drives the moving component 35 to move linearly. In this invention, the servo moving device 8 is prior art. The servo moving device 8 is electrically connected to the control device 14, and the operation of the servo moving device 8 is controlled by the control device 14.

[0039] The movable component 35 is equipped with an electromagnetic chuck 19. When the electromagnetic chuck 19 is energized, it generates magnetic force, which can attract the metal sheet metal parts on the outside of the battery pack 51. The electromagnetic chuck 19 is moved by the servo moving device 8 to pull and traction the battery pack 51.

[0040] Furthermore, the movable seat 7 is provided with a buffer limiting mechanism, which includes a buffer cylinder 31 disposed at one end of the movable seat 7 and a limiting cylinder 32 disposed at the other end of the movable seat 7. The setting direction of the buffer cylinder 31 is parallel to the moving direction of the movable seat 7 relative to the rotating seat 6, and the limiting cylinder 32 is perpendicular to the movable seat 7. The rotating seat 6 is provided with a baffle 22 corresponding to the buffer cylinder 31.

[0041] A first piston 41 is provided in the buffer cylinder 31, and a first piston chamber 42 is formed between the first piston 41 and one end of the buffer cylinder 31. A buffer telescopic rod 40 is connected to the first piston 41, and the buffer telescopic rod 40 extends from the other end of the buffer cylinder 31, with the buffer telescopic rod 40 facing the baffle 22.

[0042] A first spring 43 is provided in the first piston chamber 42, with its two ends contacting the first piston 41 and the buffer cylinder 31, respectively. A second piston 45 is provided in the limiting cylinder 32, forming a second piston chamber 46 between the second piston 45 and the lower end of the limiting cylinder 32. A second spring 47 is provided between the second piston 45 and the upper end of the limiting cylinder 32. A limiting telescopic rod 44 extends from the upper end of the limiting cylinder 32. A connecting pipe 33 is provided between the limiting cylinder 32 and the buffer cylinder 31, connecting the first piston chamber 42 and the second piston chamber 46. Transmission fluid is provided in the first piston chamber 42 and the second piston chamber 46. In this invention, the transmission fluid is hydraulic oil.

[0043] The second electric telescopic guide rail 21 drives the moving seat 7 to move between the extended position and the retracted position. When the second electric telescopic guide rail 21 is in the retracted position, the buffer telescopic rod 40 presses against the baffle 22 and is in the retracted state. At this time, the limiting telescopic rod 44 is in the extended state. The upper end of the limiting telescopic rod 44 is higher than the roller 9 and limits the battery pack 51 above the roller 9.

[0044] The control device 14 used in this invention is a PLC programmable controller, which is fixedly installed on the frame 1 on the side opposite to the counterweight 12.

[0045] This invention is installed on one side of the battery pack warehouse and is used to replace the battery pack 51 on the vehicle and to transport the replaced battery pack 51 to a storage location in the battery pack warehouse. The specific usage method is as follows:

[0046] Step 1: The vehicle whose battery pack 51 needs to be replaced is parked next to the frame 1. The moving plate is moved to one side of the battery pack 51 on the vehicle by moving the frame 1 and the lifting seat 5. The roller 9 on the moving seat is slightly lower than the bottom surface of the battery pack 51 to be replaced. Release the lock between the vehicle and the battery pack 51 so that the battery pack 51 can be pulled out from the battery rack.

[0047] Step 2: Transfer the battery pack 51 to the mobile base 7 as follows:

[0048] The first electric telescopic guide rail adjusts the horizontal position of the movable seat 7 so that the movable seat 7 is aligned with the battery pack. The second electric telescopic guide rail drives the movable seat 7 to extend towards the battery pack 51 so that the movable seat 7 reaches the extended position. At this time, one end of the movable seat 7 is close to the battery pack 51. At the same time, the servo moving device 8 drives the electromagnetic chuck 19 to move towards the battery pack 51 until it contacts the side of the battery pack 51. Then the electromagnetic chuck 19 is energized and magnetically attracts the side of the battery pack 51. The servo moving device 8 drives the electromagnetic chuck 19 to move back and pull the battery pack 51 onto the roller 9. After the battery pack 51 is completely placed on the movable seat 7, the servo moving device 8 stops moving.

[0049] The second electric telescopic guide rail 21 drives the movable seat 7 to move back and reach the retracted position. When the movable seat 7 is approaching the retracted position, the front end of the buffer telescopic rod 40 presses against the baffle and pushes the first piston 41 to move towards the end of the buffer cylinder 31 away from the baffle 22. During this process, it can play a certain buffering role for the movable seat 7. At the same time, the movement of the first piston 41 pushes the transmission pressure in the first piston chamber 42 into the second piston chamber 46, pushing the second piston 45 and the limiting telescopic rod 44 to move upward, so that the upper end of the limiting telescopic rod 44 is higher than the roller 9. The limiting telescopic rod 44 blocks the front of the battery pack 51 and plays a limiting role for the battery pack 51, preventing the battery pack 51 from slipping off the roller 9 on the movable plate due to instability caused by the movement of the frame 1.

[0050] Step 3: The battery pack 51 is transported to the front of one of the empty storage positions in the battery pack warehouse by the axial movement of the frame 1 along the ground rail 2 and the vertical movement of the lifting seat 5. Then, the rotary drive device 30 rotates 180 degrees so that the battery pack 51 on the moving seat 7 faces the storage position. During this process, the horizontal position of the moving seat is adjusted by the first electric telescopic guide rail 39 so that the moving seat is aligned with the storage position. At the same time, when the rotary drive devices 30 on the two battery pack picking and placing components rotate simultaneously, the distance between the rotating seats 6 on the two battery pack picking and placing components can be adjusted by the first electric telescopic guide rail 39 so that there is sufficient distance between the two rotating seats 6 so that the two rotating seats 6 can rotate simultaneously without collision or interference. After the rotation is completed, the second electric telescopic guide rail 21 drives the moving seat 7 to move towards the storage position. When the moving seat 7 moves towards the storage position, the buffer telescopic rod 40 moves away from the baffle 22, and the buffer telescopic rod 40 and the limiting telescopic rod 44 are reset. Then, the servo moving device 8 drives the battery suction cup to move and pushes the battery pack 51 on the roller 9 into the storage position.

[0051] Step 4: Move the mobile seat 7 to the front of the storage position containing the battery pack 51 on the battery pack warehouse by moving the frame 1 along the axis of the ground rail 2 and the vertical movement of the lifting seat 5. The battery pack 51 in the storage position is fully charged. Transfer the battery pack 51 in the storage position to the mobile seat 7. The transfer method is the same as in Step 2.

[0052] Step 5: The rotary drive device 30 rotates 180 degrees, causing the rotating seat 6 to rotate 180 degrees. Then, the distance between the two rotating seats 6 is adjusted by the first electric telescopic guide rail 39 on the two battery pack loading and unloading devices, so that the distance between the two rotating seats 6 returns to the initial state. The battery pack 51 is moved to the front of the installation position of the battery pack 51 on the vehicle by the axial movement of the frame 1 along the ground rail 2 and the vertical movement of the lifting seat 5. The second electric telescopic guide rail 21 drives the moving seat 7 to move towards the battery mounting rack on the vehicle. Then, the servo moving device 8 drives the battery suction cup to move and push the battery pack 51 on the roller 9 into the battery mounting rack. Then, the moving seat 7 and the battery suction cup are reset. The operator locks the battery pack 51 through the locking mechanism on the vehicle, connecting the battery pack 51 to the vehicle circuit.

[0053] When replacing the battery pack 51 of a vehicle, this invention can replace manual labor in carrying the heavy battery pack 51 and put the replaced battery pack 51 into the battery pack warehouse, saving time and effort, improving the replacement efficiency of the battery pack 51, and reducing the number of operators. The replacement of the battery pack 51 can be easily completed by one operator, reducing labor costs.

[0054] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A vehicle battery pack replacement device, characterized in that, It includes a frame, a ground rail, and a horizontal drive device. The frame is slidably connected to the ground rail, and the horizontal drive device drives the frame to move axially along the ground rail. The frame is equipped with vertically arranged lifting guide rails, and a lifting seat is slidably connected to the lifting guide rails. The frame is equipped with a lifting drive device for driving the lifting seat to rise and fall. The lifting seat is equipped with a battery pack loading and unloading device. The battery pack loading and unloading device includes a rotary drive unit mounted on a lifting platform, a rotary seat mounted on the rotary drive unit, a leveling adjustment device mounted on the rotary seat, a first adjusting seat mounted on the leveling adjustment device, a first electric telescopic guide rail mounted on the first adjusting seat, a second adjusting seat mounted on the first electric telescopic guide rail, a second electric telescopic guide rail mounted on the second adjusting seat, the second electric telescopic guide rail being perpendicular to the first electric telescopic guide rail, a movable seat mounted on the second electric telescopic guide rail, a roller frame mounted on the movable seat, and a roller connected to the roller frame; the movable seat also includes a battery pack push-pull device for pulling the battery pack into the movable seat or pushing the battery pack out of the movable seat; The movable seat is provided with a buffer limiting mechanism, which includes a buffer cylinder at one end of the movable seat and a limiting cylinder at the other end of the movable seat. The direction of the buffer cylinder is parallel to the direction of movement of the movable seat relative to the rotating seat; the limiting cylinder is perpendicular to the movable seat; the rotating seat is provided with a baffle corresponding to the buffer cylinder. A first piston is provided in the buffer cylinder, forming a first piston chamber between the first piston and one end of the buffer cylinder. A buffer telescopic rod is connected to the first piston and extends from the other end of the buffer cylinder. The buffer telescopic rod faces the baffle. A first spring is provided in the first piston chamber, with its two ends contacting the first piston and the buffer cylinder respectively. A second piston is provided in the limiting cylinder, forming a second piston chamber between the second piston and the lower end of the limiting cylinder. A second spring is provided between the second piston and the upper end of the limiting cylinder. A limiting telescopic rod extends from the upper end of the limiting cylinder. A connecting pipe is provided between the limiting cylinder and the buffer cylinder, connecting the first piston chamber and the second piston chamber. Transmission fluid is provided in both the first and second piston chambers. The second electric telescopic guide rail drives the moving seat to move between the extended and retracted positions. When the second electric telescopic guide rail is in the retracted position, the buffer telescopic rod abuts against the baffle and is in the retracted state. At this time, the limiting telescopic rod is in the extended state, and the upper end of the limiting telescopic rod is higher than the roller and limits the battery pack above the roller. As the moving seat approaches the retracted position, the front end of the buffer telescopic rod abuts against the baffle and pushes the first piston to move towards the end of the buffer cylinder away from the baffle. During this process, it can provide a certain buffering effect for the moving seat. At the same time, the movement of the first piston pushes the transmission pressure in the first piston chamber into the second piston chamber, pushing the second piston and the limiting telescopic rod to move upward, so that the upper end of the limiting telescopic rod is higher than the roller. The limiting telescopic rod blocks the front of the battery pack and limits the battery pack. The battery pack push-pull device includes a servo moving device mounted on a movable base, a moving component mounted on the servo moving device, and the servo moving device drives the moving component to move linearly; the moving component is equipped with an electromagnetic chuck.

2. The vehicle battery pack replacement device according to claim 1, characterized in that, The horizontal drive device includes a rack and a horizontal drive motor mounted on the frame, with the rack parallel to the ground rail; a gear is connected to the horizontal drive motor, and the gear meshes with the rack.

3. A vehicle battery pack replacement device according to any one of claims 1-2, characterized in that, The lifting drive device includes a first rotating shaft, a second rotating shaft, a first chain, a second chain, a lifting drive motor, and a counterweight. The first rotating shaft and the second rotating shaft are rotatably connected to the two sides of the upper end of the frame, and the counterweight is located on one side of the frame. The first rotating shaft is equipped with a first sprocket and a second sprocket, and the second rotating shaft is equipped with a third sprocket. One end of the first chain is connected to one side of the lifting seat, and the other end of the first chain is connected to the counterweight. The first chain is connected to both the first sprocket and the third sprocket. One end of the second chain is connected to the other side of the lifting seat, the other end of the second chain is connected to the counterweight, and the second chain is connected to the second sprocket; The lifting drive motor is located at the top of the frame and is connected to the first rotating shaft via a belt drive mechanism.

4. A vehicle battery pack replacement device according to claim 3, characterized in that, The belt drive mechanism includes a first pulley mounted on a first rotating shaft and a second pulley mounted on a lifting drive motor, with a belt connecting the first pulley and the second pulley.

5. A vehicle battery pack replacement device according to claim 4, characterized in that, The frame is provided with a counterweight guide rail, which is set along the vertical direction, and the counterweight is slidably connected to the counterweight guide rail.

6. A vehicle battery pack replacement device according to any one of claims 1-2, characterized in that, A ceiling track is installed above the frame, parallel to the ground track, and the upper end of the frame is slidably connected to the ceiling track.

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